159 citations · 320 across the 5 of their papers we have counts for
6 papers
Path-Integral Quantum Monte Carlo simulation with Open-Boundary Conditions
Zhang Jiang, Vadim N. Smelyanskiy, Sergio Boixo +1
The tunneling decay event of a metastable state in a fully connected quantum spin model can be simulated efficiently by path integral quantum Monte Carlo (QMC) [Isakov , Ph…
Scaling analysis and instantons for thermally-assisted tunneling and Quantum Monte Carlo simulations
Zhang Jiang, Vadim N. Smelyanskiy, Sergei V. Isakov +4
We develop an instantonic calculus to derive an analytical expression for the thermally-assisted tunneling decay rate of a metastable state in a fully connected quantum spin model.…
Particle-Number-Conserving Bogoliubov Approximation for Bose-Einstein Condensates Using Extended Catalytic States
Zhang Jiang, Carlton M. Caves
We encode the many-body wavefunction of a Bose-Einstein condensate (BEC) in the -particle sector of an extended catalytic state. This catalytic state is a coherent state for the…
Quantum Fisher information for states in exponential form
Zhang Jiang
We derive explicit expressions for the quantum Fisher information and the symmetric logarithmic derivative (SLD) of a quantum state in the exponential form; the SLD is expressed in…
Quantum limits on post-selected, probabilistic quantum metrology
Joshua Combes, Christopher Ferrie, Zhang Jiang +1
Probabilistic metrology attempts to improve parameter estimation by occasionally reporting an excellent estimate and the rest of the time either guessing or doing nothing at all. H…
Quantum limits on probabilistic amplifiers
Shashank Pandey, Zhang Jiang, Joshua Combes +1
An ideal phase-preserving linear amplifier is a deterministic device that adds to an input signal the minimal amount of noise consistent with the constraints imposed by quantum mec…